{"metadata":{"kernelspec":{"language":"python","display_name":"Python 3","name":"python3"},"language_info":{"pygments_lexer":"ipython3","nbconvert_exporter":"python","version":"3.6.4","file_extension":".py","codemirror_mode":{"name":"ipython","version":3},"name":"python","mimetype":"text/x-python"}},"nbformat_minor":4,"nbformat":4,"cells":[{"cell_type":"code","source":"import math, re, os, random\nimport numpy as np\nimport pandas as pd\nimport matplotlib.pyplot as plt\nimport seaborn as sns\n\nimport tensorflow as tf\nfrom sklearn.metrics import f1_score, precision_score, recall_score, confusion_matrix\nfrom kaggle_datasets import KaggleDatasets\nprint('Tensorflow version {}'.format(tf.__version__))\n\nAUTO = tf.data.experimental.AUTOTUNE","metadata":{"_uuid":"8f2839f25d086af736a60e9eeb907d3b93b6e0e5","_cell_guid":"b1076dfc-b9ad-4769-8c92-a6c4dae69d19","execution":{"iopub.status.busy":"2021-12-20T11:49:16.694341Z","iopub.execute_input":"2021-12-20T11:49:16.695068Z","iopub.status.idle":"2021-12-20T11:49:22.699579Z","shell.execute_reply.started":"2021-12-20T11:49:16.694957Z","shell.execute_reply":"2021-12-20T11:49:22.698902Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"# Detect hardware, return appropriate distribution strategy\ntry:\n    # TPU detection. No parameters necessary if TPU_NAME environment variable is set. On Kaggle this is always the case.\n    # On google colab (tpu_address = 'grpc://' + os.environ['COLAB_TPU_ADDR'], pass tpu_address as param in below fn)\n    tpu = tf.distribute.cluster_resolver.TPUClusterResolver() \n    print('Running on TPU ', tpu.master())\nexcept ValueError:\n    tpu = None\n\nif tpu:\n    tf.config.experimental_connect_to_cluster(tpu)\n    tf.tpu.experimental.initialize_tpu_system(tpu)\n    strategy = tf.distribute.experimental.TPUStrategy(tpu)\nelse:\n    strategy = tf.distribute.get_strategy() # default distribution strategy in Tensorflow. Works on CPU and single GPU.\n    #If no TPU, uncomment below to check for GPU\n    #strategy = tf.distribute.MirroredStrategy() # for GPU or multi-GPU machines\n\nprint(\"REPLICAS: \", strategy.num_replicas_in_sync)","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:49:22.700948Z","iopub.execute_input":"2021-12-20T11:49:22.701287Z","iopub.status.idle":"2021-12-20T11:49:28.717258Z","shell.execute_reply.started":"2021-12-20T11:49:22.701259Z","shell.execute_reply":"2021-12-20T11:49:28.716348Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"Kaggle utility to copy your dataset to a GCS bucket, co-located with the TPU: (If your notebook has multiple datasets, you can pass the name of your dataset to get_gcs_path).","metadata":{}},{"cell_type":"code","source":"GCS_DS_PATH = KaggleDatasets().get_gcs_path('flower-classification-with-tpus')","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:49:28.718753Z","iopub.execute_input":"2021-12-20T11:49:28.719064Z","iopub.status.idle":"2021-12-20T11:49:29.111945Z","shell.execute_reply.started":"2021-12-20T11:49:28.719023Z","shell.execute_reply":"2021-12-20T11:49:29.111115Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"## Configuration","metadata":{}},{"cell_type":"code","source":"#You can list the bucket with \"!gsutil ls $GCS_DS_PATH\"\n!gsutil ls $GCS_DS_PATH","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:49:29.113772Z","iopub.execute_input":"2021-12-20T11:49:29.114508Z","iopub.status.idle":"2021-12-20T11:49:33.001588Z","shell.execute_reply.started":"2021-12-20T11:49:29.11448Z","shell.execute_reply":"2021-12-20T11:49:33.000438Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"IMAGE_SIZE = [224, 224] # At this size, a GPU will run out of memory. Use the TPU.\n                        # For GPU training, please select 224 x 224 px image size.\nEPOCHS = 12\nBATCH_SIZE_PER_REPLICA = 128\nBATCH_SIZE = BATCH_SIZE_PER_REPLICA * strategy.num_replicas_in_sync\n\nGCS_PATH_SELECT = { # available image sizes\n    192: GCS_DS_PATH + '/tfrecords-jpeg-192x192',\n    224: GCS_DS_PATH + '/tfrecords-jpeg-224x224',\n    331: GCS_DS_PATH + '/tfrecords-jpeg-331x331',\n    512: GCS_DS_PATH + '/tfrecords-jpeg-512x512'\n}\nGCS_PATH = GCS_PATH_SELECT[IMAGE_SIZE[0]]\n\nTRAINING_FILENAMES = tf.io.gfile.glob(GCS_PATH + '/train/*.tfrec')\nVALIDATION_FILENAMES = tf.io.gfile.glob(GCS_PATH + '/val/*.tfrec')\nTEST_FILENAMES = tf.io.gfile.glob(GCS_PATH + '/test/*.tfrec') # predictions on this dataset should be submitted for the competition","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:49:33.003607Z","iopub.execute_input":"2021-12-20T11:49:33.003962Z","iopub.status.idle":"2021-12-20T11:49:33.224808Z","shell.execute_reply.started":"2021-12-20T11:49:33.003916Z","shell.execute_reply":"2021-12-20T11:49:33.224147Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"CLASSES = ['pink primrose',    'hard-leaved pocket orchid', 'canterbury bells', 'sweet pea',     'wild geranium',     'tiger lily',           'moon orchid',              'bird of paradise', 'monkshood',        'globe thistle',         # 00 - 09\n           'snapdragon',       \"colt's foot\",               'king protea',      'spear thistle', 'yellow iris',       'globe-flower',         'purple coneflower',        'peruvian lily',    'balloon flower',   'giant white arum lily', # 10 - 19\n           'fire lily',        'pincushion flower',         'fritillary',       'red ginger',    'grape hyacinth',    'corn poppy',           'prince of wales feathers', 'stemless gentian', 'artichoke',        'sweet william',         # 20 - 29\n           'carnation',        'garden phlox',              'love in the mist', 'cosmos',        'alpine sea holly',  'ruby-lipped cattleya', 'cape flower',              'great masterwort', 'siam tulip',       'lenten rose',           # 30 - 39\n           'barberton daisy',  'daffodil',                  'sword lily',       'poinsettia',    'bolero deep blue',  'wallflower',           'marigold',                 'buttercup',        'daisy',            'common dandelion',      # 40 - 49\n           'petunia',          'wild pansy',                'primula',          'sunflower',     'lilac hibiscus',    'bishop of llandaff',   'gaura',                    'geranium',         'orange dahlia',    'pink-yellow dahlia',    # 50 - 59\n           'cautleya spicata', 'japanese anemone',          'black-eyed susan', 'silverbush',    'californian poppy', 'osteospermum',         'spring crocus',            'iris',             'windflower',       'tree poppy',            # 60 - 69\n           'gazania',          'azalea',                    'water lily',       'rose',          'thorn apple',       'morning glory',        'passion flower',           'lotus',            'toad lily',        'anthurium',             # 70 - 79\n           'frangipani',       'clematis',                  'hibiscus',         'columbine',     'desert-rose',       'tree mallow',          'magnolia',                 'cyclamen ',        'watercress',       'canna lily',            # 80 - 89\n           'hippeastrum ',     'bee balm',                  'pink quill',       'foxglove',      'bougainvillea',     'camellia',             'mallow',                   'mexican petunia',  'bromelia',         'blanket flower',        # 90 - 99\n           'trumpet creeper',  'blackberry lily',           'common tulip',     'wild rose']                                                                                                                                               # 100 - 102","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:49:33.22586Z","iopub.execute_input":"2021-12-20T11:49:33.226164Z","iopub.status.idle":"2021-12-20T11:49:33.235157Z","shell.execute_reply.started":"2021-12-20T11:49:33.226137Z","shell.execute_reply":"2021-12-20T11:49:33.234532Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"## Visualization utilities","metadata":{}},{"cell_type":"code","source":"# numpy and matplotlib defaults\nnp.set_printoptions(threshold=15, linewidth=80)\n\ndef batch_to_numpy_images_and_labels(data):\n    images, labels = data\n    numpy_images = images.numpy()\n    numpy_labels = labels.numpy()\n    if numpy_labels.dtype == object: # binary string in this case, these are image ID strings\n        numpy_labels = [None for _ in enumerate(numpy_images)]\n    # If no labels, only image IDs, return None for labels (this is the case for test data)\n    return numpy_images, numpy_labels\n\ndef title_from_label_and_target(label, correct_label):\n    if correct_label is None:\n        return CLASSES[label], True\n    correct = (label == correct_label)\n    return \"{} [{}{}{}]\".format(CLASSES[label], 'OK' if correct else 'NO', u\"\\u2192\" if not correct else '',\n                                CLASSES[correct_label] if not correct else ''), correct\n\ndef display_one_flower(image, title, subplot, red=False, titlesize=16):\n    plt.subplot(*subplot)\n    plt.axis('off')\n    plt.imshow(image)\n    if len(title) > 0:\n        plt.title(title, fontsize=int(titlesize) if not red else int(titlesize/1.2), color='red' if red else 'black', fontdict={'verticalalignment':'center'}, pad=int(titlesize/1.5))\n    return (subplot[0], subplot[1], subplot[2]+1)\n\ndef display_batch_of_images(databatch, predictions=None):\n    \"\"\"This will work with:\n    display_batch_of_images(images)\n    display_batch_of_images(images, predictions)\n    display_batch_of_images((images, labels))\n    display_batch_of_images((images, labels), predictions)\n    \"\"\"\n    # data\n    images, labels = batch_to_numpy_images_and_labels(databatch)\n    if labels is None:\n        labels = [None for _ in enumerate(images)]\n        \n    # auto-squaring: this will drop data that does not fit into square or square-ish rectangle\n    rows = int(math.sqrt(len(images)))\n    cols = len(images)//rows\n    \n    # size and spacing\n    FIGSIZE = 13.0\n    SPACING = 0.1\n    subplot=(rows,cols,1)\n    if rows < cols:\n        plt.figure(figsize=(FIGSIZE,FIGSIZE/cols*rows))\n    else:\n        plt.figure(figsize=(FIGSIZE/rows*cols,FIGSIZE))\n    \n    # display\n    for i, (image, label) in enumerate(zip(images[:rows*cols], labels[:rows*cols])):\n        title = '' if label is None else CLASSES[label]\n        correct = True\n        if predictions is not None:\n            title, correct = title_from_label_and_target(predictions[i], label)\n        dynamic_titlesize = FIGSIZE*SPACING/max(rows,cols)*40+3 # magic formula tested to work from 1x1 to 10x10 images\n        subplot = display_one_flower(image, title, subplot, not correct, titlesize=dynamic_titlesize)\n    \n    #layout\n    plt.tight_layout()\n    if label is None and predictions is None:\n        plt.subplots_adjust(wspace=0, hspace=0)\n    else:\n        plt.subplots_adjust(wspace=SPACING, hspace=SPACING)\n    plt.show()\n    \n\ndef display_confusion_matrix(cmat, score, precision, recall):\n    plt.figure(figsize=(15,15))\n    ax = plt.gca()\n    ax.matshow(cmat, cmap='Reds')\n    ax.set_xticks(range(len(CLASSES)))\n    ax.set_xticklabels(CLASSES, fontdict={'fontsize': 7})\n    plt.setp(ax.get_xticklabels(), rotation=45, ha=\"left\", rotation_mode=\"anchor\")\n    ax.set_yticks(range(len(CLASSES)))\n    ax.set_yticklabels(CLASSES, fontdict={'fontsize': 7})\n    plt.setp(ax.get_yticklabels(), rotation=45, ha=\"right\", rotation_mode=\"anchor\")\n    titlestring = \"\"\n    if score is not None:\n        titlestring += 'f1 = {:.3f} '.format(score)\n    if precision is not None:\n        titlestring += '\\nprecision = {:.3f} '.format(precision)\n    if recall is not None:\n        titlestring += '\\nrecall = {:.3f} '.format(recall)\n    if len(titlestring) > 0:\n        ax.text(101, 1, titlestring, fontdict={'fontsize': 18, 'horizontalalignment':'right', 'verticalalignment':'top', 'color':'#804040'})\n    plt.show()\n\n\ndef display_training_curves(training, validation, title, subplot):\n    if subplot%10==1: # set up the subplots on the first call\n        plt.subplots(figsize=(10,10), facecolor='#F0F0F0')\n        plt.tight_layout()\n    ax = plt.subplot(subplot)\n    ax.set_facecolor('#F8F8F8')\n    ax.plot(training)\n    ax.plot(validation)\n    ax.set_title('model '+ title)\n    ax.set_ylabel(title)\n    #ax.set_ylim(0.28,1.05)\n    ax.set_xlabel('epoch')\n    ax.legend(['train', 'valid.'])","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:49:33.236821Z","iopub.execute_input":"2021-12-20T11:49:33.237128Z","iopub.status.idle":"2021-12-20T11:49:33.26922Z","shell.execute_reply.started":"2021-12-20T11:49:33.237091Z","shell.execute_reply":"2021-12-20T11:49:33.268472Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"## Blockout augumentation","metadata":{}},{"cell_type":"code","source":"# def random_blockout(img, sl=0.1, sh=0.2, rl=0.4):\n#     p=random.random()\n#     if p>=0.25:\n#         h, w, c = *IMAGE_SIZE, 3\n#         origin_area = tf.cast(h*w, tf.float32)\n\n#         e_size_l = tf.cast(tf.round(tf.sqrt(origin_area * sl * rl)), tf.int32)\n#         e_size_h = tf.cast(tf.round(tf.sqrt(origin_area * sh / rl)), tf.int32)\n\n#         e_height_h = tf.minimum(e_size_h, h)\n#         e_width_h = tf.minimum(e_size_h, w)\n\n#         erase_height = tf.random.uniform(shape=[], minval=e_size_l, maxval=e_height_h, dtype=tf.int32)\n#         erase_width = tf.random.uniform(shape=[], minval=e_size_l, maxval=e_width_h, dtype=tf.int32)\n\n#         erase_area = tf.zeros(shape=[erase_height, erase_width, c])\n#         erase_area = tf.cast(erase_area, tf.uint8)\n\n#         pad_h = h - erase_height\n#         pad_top = tf.random.uniform(shape=[], minval=0, maxval=pad_h, dtype=tf.int32)\n#         pad_bottom = pad_h - pad_top\n        \n#         pad_w = w - erase_width\n#         pad_left = tf.random.uniform(shape=[], minval=0, maxval=pad_w, dtype=tf.int32)\n#         pad_right = pad_w - pad_left\n\n#         erase_mask = tf.pad([erase_area], [[0,0],[pad_top, pad_bottom], [pad_left, pad_right], [0,0]], constant_values=1)\n#         erase_mask = tf.squeeze(erase_mask, axis=0)\n#         erased_img = tf.multiply(tf.cast(img,tf.float32), tf.cast(erase_mask, tf.float32))\n\n#         return tf.cast(erased_img, img.dtype)\n#     else:\n#         return tf.cast(img, img.dtype)","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:49:33.271152Z","iopub.execute_input":"2021-12-20T11:49:33.271857Z","iopub.status.idle":"2021-12-20T11:49:33.28472Z","shell.execute_reply.started":"2021-12-20T11:49:33.271813Z","shell.execute_reply":"2021-12-20T11:49:33.283841Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"## Datasets","metadata":{}},{"cell_type":"code","source":"def decode_image(image_data):\n    image = tf.image.decode_jpeg(image_data, channels=3)  # image format uint8 [0,255]\n    image = tf.reshape(image, [*IMAGE_SIZE, 3]) # explicit size needed for TPU\n    return image\n\ndef read_labeled_tfrecord(example):\n    LABELED_TFREC_FORMAT = {\n        \"image\": tf.io.FixedLenFeature([], tf.string), # tf.string means bytestring\n        \"class\": tf.io.FixedLenFeature([], tf.int64),  # shape [] means single element\n    }\n    example = tf.io.parse_single_example(example, LABELED_TFREC_FORMAT)\n    image = decode_image(example['image'])\n    label = tf.cast(example['class'], tf.int32)\n    return image, label # returns a dataset of (image, label) pairs\n\ndef read_unlabeled_tfrecord(example):\n    UNLABELED_TFREC_FORMAT = {\n        \"image\": tf.io.FixedLenFeature([], tf.string), # tf.string means bytestring\n        \"id\": tf.io.FixedLenFeature([], tf.string),  # shape [] means single element\n        # class is missing, this competitions's challenge is to predict flower classes for the test dataset\n    }\n    example = tf.io.parse_single_example(example, UNLABELED_TFREC_FORMAT)\n    image = decode_image(example['image'])\n    idnum = example['id']\n    return image, idnum # returns a dataset of image(s)\n\ndef load_dataset(filenames, labeled=True, ordered=False):\n    # Read from TFRecords. For optimal performance, reading from multiple files at once and\n    # disregarding data order. Order does not matter since we will be shuffling the data anyway.\n\n    ignore_order = tf.data.Options()\n    if not ordered:\n        ignore_order.experimental_deterministic = False # disable order, increase speed\n\n    dataset = tf.data.TFRecordDataset(filenames, num_parallel_reads=AUTO) # automatically interleaves reads from multiple files\n    dataset = dataset.with_options(ignore_order) # uses data as soon as it streams in, rather than in its original order\n    dataset = dataset.map(read_labeled_tfrecord if labeled else read_unlabeled_tfrecord, num_parallel_calls=AUTO)\n    # returns a dataset of (image, label) pairs if labeled=True or (image, id) pairs if labeled=False\n    return dataset\n\ndef data_augment(image, label):\n    # data augmentation. Thanks to the dataset.prefetch(AUTO) statement in the next function (below),\n    # this happens essentially for free on TPU. Data pipeline code is executed on the \"CPU\" part\n    # of the TPU while the TPU itself is computing gradients.\n    image = tf.image.random_flip_left_right(image)\n    image = tf.image.random_saturation(image, 0, 2)\n#     image = tf.image.adjust_brightness(image, 0.4)\n#     image = random_blockout(image)\n    return image, label   \n\ndef get_training_dataset():\n    dataset = load_dataset(TRAINING_FILENAMES, labeled=True)\n    dataset = dataset.map(data_augment, num_parallel_calls=AUTO)\n    dataset = dataset.repeat() # the training dataset must repeat for several epochs\n    dataset = dataset.shuffle(2048)\n    dataset = dataset.batch(BATCH_SIZE)\n    dataset = dataset.prefetch(AUTO) # prefetch next batch while training (autotune prefetch buffer size)\n    return dataset\n\ndef get_validation_dataset(ordered=False):\n    dataset = load_dataset(VALIDATION_FILENAMES, labeled=True, ordered=ordered)\n    dataset = dataset.batch(BATCH_SIZE)\n    dataset = dataset.cache()\n    dataset = dataset.prefetch(AUTO) # prefetch next batch while training (autotune prefetch buffer size)\n    return dataset\n\ndef get_test_dataset(ordered=False):\n    dataset = load_dataset(TEST_FILENAMES, labeled=False, ordered=ordered)\n    dataset = dataset.batch(BATCH_SIZE)\n    dataset = dataset.prefetch(AUTO) # prefetch next batch while training (autotune prefetch buffer size)\n    return dataset\n\ndef count_data_items(filenames):\n    # the number of data items is written in the name of the .tfrec files, i.e. flowers00-230.tfrec = 230 data items\n    n = [int(re.compile(r\"-([0-9]*)\\.\").search(filename).group(1)) for filename in filenames]\n    return np.sum(n)\n\nNUM_TRAINING_IMAGES = count_data_items(TRAINING_FILENAMES)\nNUM_VALIDATION_IMAGES = count_data_items(VALIDATION_FILENAMES)\nNUM_TEST_IMAGES = count_data_items(TEST_FILENAMES)\nSTEPS_PER_EPOCH = NUM_TRAINING_IMAGES // BATCH_SIZE\nVALIDATION_STEPS = -(-NUM_VALIDATION_IMAGES // BATCH_SIZE) # The \"-(-//)\" trick rounds up instead of down :-)\nTEST_STEPS = -(-NUM_TEST_IMAGES // BATCH_SIZE)             # The \"-(-//)\" trick rounds up instead of down :-)\nprint('Dataset: {} training images, {} validation images, {} unlabeled test images'.format(NUM_TRAINING_IMAGES, NUM_VALIDATION_IMAGES, NUM_TEST_IMAGES))","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:49:33.28606Z","iopub.execute_input":"2021-12-20T11:49:33.286272Z","iopub.status.idle":"2021-12-20T11:49:33.308118Z","shell.execute_reply.started":"2021-12-20T11:49:33.286247Z","shell.execute_reply":"2021-12-20T11:49:33.307476Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"## Data visualization","metadata":{}},{"cell_type":"code","source":"# data dump\nprint(\"Training data shapes:\")\nfor image, label in get_training_dataset().take(3):\n    print(image.numpy().shape, label.numpy().shape)\nprint(\"Training data label examples:\", label.numpy())\nprint(\"Validation data shapes:\")\nfor image, label in get_validation_dataset().take(3):\n    print(image.numpy().shape, label.numpy().shape)\nprint(\"Validation data label examples:\", label.numpy())\nprint(\"Test data shapes:\")\nfor image, idnum in get_test_dataset().take(3):\n    print(image.numpy().shape, idnum.numpy().shape)\nprint(\"Test data IDs:\", idnum.numpy().astype('U')) # U=unicode string","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:49:33.310651Z","iopub.execute_input":"2021-12-20T11:49:33.311356Z","iopub.status.idle":"2021-12-20T11:49:39.962577Z","shell.execute_reply.started":"2021-12-20T11:49:33.311322Z","shell.execute_reply":"2021-12-20T11:49:39.960914Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"# Peek at training data\ntraining_dataset = get_training_dataset()\ntraining_dataset = training_dataset.unbatch().batch(20)\ntrain_batch = iter(training_dataset)","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:49:39.963667Z","iopub.execute_input":"2021-12-20T11:49:39.963876Z","iopub.status.idle":"2021-12-20T11:49:40.014398Z","shell.execute_reply.started":"2021-12-20T11:49:39.963849Z","shell.execute_reply":"2021-12-20T11:49:40.013712Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"# run this cell again for next set of images\ndisplay_batch_of_images(next(train_batch))","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:49:40.015806Z","iopub.execute_input":"2021-12-20T11:49:40.016279Z","iopub.status.idle":"2021-12-20T11:49:42.302773Z","shell.execute_reply.started":"2021-12-20T11:49:40.016237Z","shell.execute_reply":"2021-12-20T11:49:42.302056Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"# peer at test data\ntest_dataset = get_test_dataset()\ntest_dataset = test_dataset.unbatch().batch(20)\ntest_batch = iter(test_dataset)","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:49:42.303735Z","iopub.execute_input":"2021-12-20T11:49:42.304276Z","iopub.status.idle":"2021-12-20T11:49:42.336846Z","shell.execute_reply.started":"2021-12-20T11:49:42.304243Z","shell.execute_reply":"2021-12-20T11:49:42.33615Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"# run this cell again for next set of images\ndisplay_batch_of_images(next(test_batch))","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:49:42.337846Z","iopub.execute_input":"2021-12-20T11:49:42.338578Z","iopub.status.idle":"2021-12-20T11:49:44.510806Z","shell.execute_reply.started":"2021-12-20T11:49:42.338472Z","shell.execute_reply":"2021-12-20T11:49:44.507819Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"## Model","metadata":{}},{"cell_type":"code","source":"with strategy.scope():\n#     img_adjust_layer = tf.keras.layers.Lambda(lambda data: tf.keras.applications.efficientnet.preprocess_input(tf.cast(data, tf.float32)), input_shape=[*IMAGE_SIZE, 3])\n#     pretrained_model = tf.keras.applications.EfficientNetB1(weights='imagenet', include_top=False)\n\n#     img_adjust_layer = tf.keras.layers.Lambda(lambda data: tf.keras.applications.resnet.preprocess_input(tf.cast(data, tf.float32)), input_shape=[*IMAGE_SIZE, 3])\n#     pretrained_model = tf.keras.applications.ResNet101(weights='imagenet', include_top=False)\n    \n#     model = tf.keras.Sequential([\n#         img_adjust_layer,\n#         pretrained_model,\n#         tf.keras.layers.GlobalAveragePooling2D(),\n#         tf.keras.layers.Dense(len(CLASSES), activation='softmax')\n#     ])\n    input = tf.keras.layers.Input(shape=[*IMAGE_SIZE, 3])\n    img_adjust_layer = tf.keras.layers.Lambda(lambda data: tf.keras.applications.resnet.preprocess_input(tf.cast(data, tf.float32)))(input)\n    pretrained_model = tf.keras.applications.ResNet50(weights='imagenet', include_top=False)(img_adjust_layer)\n    x = tf.keras.layers.GlobalAveragePooling2D()(pretrained_model)\n    x = tf.keras.layers.Dense(len(CLASSES), activation='softmax')(x)\n    \n    model = tf.keras.models.Model(inputs=input, outputs=x)\n    \n    pretrained_model.trainable = False # False = transfer learning, True = fine-tuning\n    \n\nmodel.compile(\n    optimizer='adam',\n    loss = 'sparse_categorical_crossentropy',\n    metrics=['sparse_categorical_accuracy'],\n    # NEW on TPU in TensorFlow 24: sending multiple batches to the TPU at once saves communications\n    # overheads and allows the XLA compiler to unroll the loop on TPU and optimize hardware utilization.\n    steps_per_execution=16\n)\nmodel.summary()","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:49:44.512229Z","iopub.execute_input":"2021-12-20T11:49:44.512566Z","iopub.status.idle":"2021-12-20T11:49:57.172109Z","shell.execute_reply.started":"2021-12-20T11:49:44.512528Z","shell.execute_reply":"2021-12-20T11:49:57.171221Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"## **Initialize callbacks**","metadata":{}},{"cell_type":"code","source":"earlystop = tf.keras.callbacks.EarlyStopping(monitor='val_loss', patience=5)\n# learning_rate_reduction = tf.keras.callbacks.ReduceLROnPlateau(monitor='val_loss', \n#                                             patience=2, \n#                                             verbose=1, \n#                                             factor=0.5, \n#                                             min_lr=0.00001)\n# callbacks = [earlystop, learning_rate_reduction]\n\ndef lrfn(epoch):\n    LR_START = 0.00001\n    LR_MAX = 0.00005 * strategy.num_replicas_in_sync\n    LR_MIN = 0.00001\n    LR_RAMPUP_EPOCHS = 5\n    LR_SUSTAIN_EPOCHS = 0\n    LR_EXP_DECAY = .8\n    \n    if epoch < LR_RAMPUP_EPOCHS:\n        lr = (LR_MAX - LR_START) / LR_RAMPUP_EPOCHS * epoch + LR_START\n    elif epoch < LR_RAMPUP_EPOCHS + LR_SUSTAIN_EPOCHS:\n        lr = LR_MAX\n    else:\n        lr = (LR_MAX - LR_MIN) * LR_EXP_DECAY**(epoch - LR_RAMPUP_EPOCHS - LR_SUSTAIN_EPOCHS) + LR_MIN\n    return lr\n\nlr_schedule = tf.keras.callbacks.LearningRateScheduler(lrfn, verbose=1)\n\ncallbacks = [earlystop, lr_schedule]\n\nrng = [i for i in range(EPOCHS)]\ny = [lrfn(x) for x in rng]\nplt.plot(rng, [lrfn(x) for x in rng])\nprint(y[0], y[-1])","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:49:57.17331Z","iopub.execute_input":"2021-12-20T11:49:57.173985Z","iopub.status.idle":"2021-12-20T11:49:57.408555Z","shell.execute_reply.started":"2021-12-20T11:49:57.173944Z","shell.execute_reply":"2021-12-20T11:49:57.40769Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"## Training","metadata":{}},{"cell_type":"code","source":"history = model.fit(get_training_dataset(), steps_per_epoch=STEPS_PER_EPOCH, epochs=EPOCHS,\n                    validation_data=get_validation_dataset(), validation_steps=VALIDATION_STEPS,\n                    callbacks=[callbacks])","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:49:57.409688Z","iopub.execute_input":"2021-12-20T11:49:57.40992Z","iopub.status.idle":"2021-12-20T11:51:53.466375Z","shell.execute_reply.started":"2021-12-20T11:49:57.409892Z","shell.execute_reply":"2021-12-20T11:51:53.465423Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"display_training_curves(history.history['loss'], history.history['val_loss'], 'loss', 211)\ndisplay_training_curves(history.history['sparse_categorical_accuracy'], history.history['val_sparse_categorical_accuracy'], 'accuracy', 212)","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:51:53.467972Z","iopub.execute_input":"2021-12-20T11:51:53.46822Z","iopub.status.idle":"2021-12-20T11:51:53.994184Z","shell.execute_reply.started":"2021-12-20T11:51:53.468191Z","shell.execute_reply":"2021-12-20T11:51:53.993271Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"## Confusion Matrix","metadata":{}},{"cell_type":"code","source":"cmdataset = get_validation_dataset(ordered=True) # since we are splitting the dataset and iterating separately on images and labels, order matters.\nimages_ds = cmdataset.map(lambda image, label: image)\nlabels_ds = cmdataset.map(lambda image, label: label).unbatch()\ncm_correct_labels = next(iter(labels_ds.batch(NUM_VALIDATION_IMAGES))).numpy() # get everything as one batch\ncm_probabilities = model.predict(images_ds, steps=VALIDATION_STEPS)\ncm_predictions = np.argmax(cm_probabilities, axis=-1)\nprint(\"Correct   labels: \", cm_correct_labels.shape, cm_correct_labels)\nprint(\"Predicted labels: \", cm_predictions.shape, cm_predictions)","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:51:53.995477Z","iopub.execute_input":"2021-12-20T11:51:53.995699Z","iopub.status.idle":"2021-12-20T11:52:14.552045Z","shell.execute_reply.started":"2021-12-20T11:51:53.995673Z","shell.execute_reply":"2021-12-20T11:52:14.551146Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"cmat = confusion_matrix(cm_correct_labels, cm_predictions, labels=range(len(CLASSES)))\nscore = f1_score(cm_correct_labels, cm_predictions, labels=range(len(CLASSES)), average='macro')\nprecision = precision_score(cm_correct_labels, cm_predictions, labels=range(len(CLASSES)), average='macro')\nrecall = recall_score(cm_correct_labels, cm_predictions, labels=range(len(CLASSES)), average='macro')\ncmat = (cmat.T / cmat.sum(axis=1)).T # normalized\ndisplay_confusion_matrix(cmat, score, precision, recall)\nprint('f1 score: {:.3f}, precision: {:.3f}, recall: {:.3f}'.format(score, precision, recall))","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:52:14.553449Z","iopub.execute_input":"2021-12-20T11:52:14.553826Z","iopub.status.idle":"2021-12-20T11:52:19.72849Z","shell.execute_reply.started":"2021-12-20T11:52:14.553782Z","shell.execute_reply":"2021-12-20T11:52:19.727642Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"## Predictions","metadata":{}},{"cell_type":"code","source":"test_ds = get_test_dataset(ordered=True) # since we are splitting the dataset and iterating separately on images and ids, order matters.\n\nprint('Computing predictions...')\ntest_images_ds = test_ds.map(lambda image, idnum: image)\nprobabilities = model.predict(test_images_ds, steps=TEST_STEPS)\npredictions = np.argmax(probabilities, axis=-1)\nprint(predictions)\n\nprint('Generating submission.csv file...')\ntest_ids_ds = test_ds.map(lambda image, idnum: idnum).unbatch()\ntest_ids = next(iter(test_ids_ds.batch(NUM_TEST_IMAGES))).numpy().astype('U') # all in one batch\nnp.savetxt('submission.csv', np.rec.fromarrays([test_ids, predictions]), fmt=['%s', '%d'], delimiter=',', header='id,label', comments='')\n!head submission.csv","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:52:19.729684Z","iopub.execute_input":"2021-12-20T11:52:19.730007Z","iopub.status.idle":"2021-12-20T11:52:27.885461Z","shell.execute_reply.started":"2021-12-20T11:52:19.729977Z","shell.execute_reply":"2021-12-20T11:52:27.884546Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"markdown","source":"## Visual validation","metadata":{}},{"cell_type":"code","source":"dataset = get_validation_dataset()\ndataset = dataset.unbatch().batch(20)\nbatch = iter(dataset)","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:52:27.887333Z","iopub.execute_input":"2021-12-20T11:52:27.888043Z","iopub.status.idle":"2021-12-20T11:52:27.931782Z","shell.execute_reply.started":"2021-12-20T11:52:27.888001Z","shell.execute_reply":"2021-12-20T11:52:27.930935Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"# run this cell again for next set of images\nimages, labels = next(batch)\nprobabilities = model.predict(tf.cast(images, tf.float32))\npredictions = np.argmax(probabilities, axis=-1)\ndisplay_batch_of_images((images, labels), predictions)","metadata":{"execution":{"iopub.status.busy":"2021-12-20T11:52:27.933668Z","iopub.execute_input":"2021-12-20T11:52:27.934101Z","iopub.status.idle":"2021-12-20T11:52:39.201435Z","shell.execute_reply.started":"2021-12-20T11:52:27.934059Z","shell.execute_reply":"2021-12-20T11:52:39.20045Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"","metadata":{},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"","metadata":{},"execution_count":null,"outputs":[]}]}